Improvement in harvester cutter-bars



E. C. KEYS. Harvester Cutter-Bar.

No. 209,172. Pa'fented Oct. 22, 1878.

lnlnsses l IME-miur NJETERS. PHDTG-LQTHDGRAPNER, WASHINGTON, D C.

UNITED STATES PATENT OEEIoEo EZRA C. KEYS, OF ALLEGHENY, PENNSYLVANIA.

IMPROVEMENT N 'l-lAnvl-:STER CUTTER-BARS.

Speciiication forming part of Letters Patent No. 209,172, dated October22, 1878; application filed April 1, 1878.

To all whom it 'may concern Be it known that I, EZRA C. KEYS, of'Allegheny, in the county of Allegheny and State of Pennsylvania, haveinvented a new and useful Iinproveinentin Securing the Gutters to theCutterBars of Harvesters; and I do hereby declare that the following isa full and 'exact description thereof, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.

My invention relates to an improvement in securing the cutters to thecutter-bars of harvesters; and consistsin bevelin g the rear ends andsides of the cutters, and placing them in dovetail recesses made in thecutter-bar, and securing them in a fixed position by means ot wedgesplaced in dovetail grooves inthe rear of the cutter.

To enable others skilled in the art to make and use myinvention, Iwillproceed to describe its construction and operation'.

In the accompanyin g drawings, which form p art of my speciiication,Figure lis a top view or plan of my improvement. Fig. 2is a longitudinalsection ofthe cutter-bar and transverse section of the cutters at lineg/if. Fig. 3 is a longitudinal section ofthe cutters and transversesection of the bar and wedge at line y' y.

In the drawings, A is the cutter-bar, furnished with dovetail recessesB. D are the cutters, which are beveled along their sides, which are setinto dovetailed recesses B in the cutter-bar, as illustrated in Fig. 2,and which are also beveled along their rear edges, so as to engage withcorrespondingly-dovetailed wedges O, as shown in the sectional view,Fig. 3, taken through a cutter and wedge. C are the wedges placed in adovetailed groove in the bar A at the rear end of the cutters, whichwedges are secured in position by means of a set-screw, e. These wedgesare beveled, as shown in Fig. 3, and t into the dovetailed groove in thecutter-bar, so that one side of each wedge will be secured by thecontinuous beveled side m of the longitudinal dovetailed groove inthebar A, while the other sides will be secured at the points Z by thedovetailed portions of the bar which are between the recesses B, theremaining port-ions of said sides of the wedges engaging with the rearbeveled edges of the cutters D. The cutter-bar, with its recesses, maybe constructed of steel by the casting process. The wedges should beformed of cast-steel and the cutters also of' steel, the latter vhavin gthe usual cutting-edges.

'The form ofthe rear end of the cutters and their adaptation to therecesses, and the manner of securing them in the recesses, are clearlyTshown in the accompanyin gdrawin gs. ois the opening for pivotingv thecutter-bar to the machine. The wedges are made in sections, asrepresented in Fig. l, and are removed by removing the section of thewedge marked lr, which is held in position by the set-screw e. lt

will be observed that the back end of the teeth correspond to the frontedge of the wedge.

Having thus described my improvement, what I claim is- A cutter-bar forharvesters, provided with dovetailed recesses B and groove f, incombinationwith the wedges C and cutters D, as and for the purpose setforth.

EZBA C. KEYS.

Witnesses A. C. J oHNsToN, B. L. JOHNSTON.

